EP0930511A3 - Variable external capacitor for NMR probe - Google Patents

Variable external capacitor for NMR probe Download PDF

Info

Publication number
EP0930511A3
EP0930511A3 EP98300267A EP98300267A EP0930511A3 EP 0930511 A3 EP0930511 A3 EP 0930511A3 EP 98300267 A EP98300267 A EP 98300267A EP 98300267 A EP98300267 A EP 98300267A EP 0930511 A3 EP0930511 A3 EP 0930511A3
Authority
EP
European Patent Office
Prior art keywords
capacitor
variable external
plunger
drum
external capacitor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98300267A
Other languages
German (de)
French (fr)
Other versions
EP0930511B1 (en
EP0930511A2 (en
Inventor
James P. Finningan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Varian Inc
Original Assignee
Varian Associates Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Varian Associates Inc filed Critical Varian Associates Inc
Priority to EP19980300267 priority Critical patent/EP0930511B1/en
Publication of EP0930511A2 publication Critical patent/EP0930511A2/en
Publication of EP0930511A3 publication Critical patent/EP0930511A3/en
Application granted granted Critical
Publication of EP0930511B1 publication Critical patent/EP0930511B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
    • G01R33/3628—Tuning/matching of the transmit/receive coil
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
    • G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
    • G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
    • G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
    • G01R33/34092—RF coils specially adapted for NMR spectrometers

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Leads Or Probes (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)

Abstract

A variable external capacitor (14) produces greater functionality for NMR probes by reducing the size of components and efficiently arranging the components. The variable external capacity has a cavity (12) that allows adjustment tools to be extended through the variable external capacitor to adjust additional components that may be stacked above the variable external capacitor. The cavity may be used to house reactance such as a fixed capacitor or inductor connected in parallel with the variable external capacitor. The variable external capacitor comprises a Teflon housing (14) configured to minimize its size and reduce lead lengths of the NMR circuit. A silver deposit plate (34) on the Teflon housing constitutes a stationary capacitor plate. A drum (18) disposed inside the cavity and movably spaced from the stationary capacitor plate functions as a movable capacitor plate. An anto-rotation rail (22) supports the drum to prevent rotation. The drum includes internal threads (54) that cooperates with threads provided in a plunger (20) for adjustment of the drum in a translational direction. The plunger is supported by the rail and extends outside the cavity of the Teflon housing for rotational adjustment. An insulator (16) spaces the plunger and the drum from the stationary capacitor plate. The insulator and plunger provide a through passageway for an adjustment tool to extend therethrough. Alternatively, the space inside the insulator and plunger may be used to house a capacitor or inductor electrically supported by a current-conducting stick and connected in parallel with the variable external capacitor. A capacitor stick shifts the capacitance of the variable external capacitor, while an inductor stick forms a parallel LC resonant circuit. The structure provides the flexibility of choosing a stick to form a desirable circuit element for increased functionality of the NMR probe.
EP19980300267 1998-01-15 1998-01-15 Variable external capacitor for NMR probe Expired - Lifetime EP0930511B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19980300267 EP0930511B1 (en) 1998-01-15 1998-01-15 Variable external capacitor for NMR probe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19980300267 EP0930511B1 (en) 1998-01-15 1998-01-15 Variable external capacitor for NMR probe

Publications (3)

Publication Number Publication Date
EP0930511A2 EP0930511A2 (en) 1999-07-21
EP0930511A3 true EP0930511A3 (en) 1999-12-01
EP0930511B1 EP0930511B1 (en) 2006-06-21

Family

ID=8234621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980300267 Expired - Lifetime EP0930511B1 (en) 1998-01-15 1998-01-15 Variable external capacitor for NMR probe

Country Status (1)

Country Link
EP (1) EP0930511B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6833704B1 (en) * 2003-07-21 2004-12-21 Varian, Inc. Multinuclear wands
DE102017211401B3 (en) 2017-07-04 2018-10-18 Bruker Biospin Ag Adaptation device for an RF resonant circuit of an NMR probe head

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2092998A5 (en) * 1970-05-15 1972-01-28 Anvar
EP0165741A2 (en) * 1984-06-22 1985-12-27 Varian Associates, Inc. Double post reentrant cavity for NMR probes
EP0223284A2 (en) * 1985-11-02 1987-05-27 Philips Patentverwaltung GmbH High frequency coil arrangement for nuclear spin resonance device
US4851961A (en) * 1988-11-14 1989-07-25 Funk Alexander L Endless reactor
EP0401967A2 (en) * 1989-06-09 1990-12-12 Oxley Developments Company Limited Adjustable electrical device
US4996482A (en) * 1988-09-22 1991-02-26 Jeol Ltd. Capacitor stick for NMR probe
DE4239041A1 (en) * 1991-11-22 1993-05-27 Varian Associates

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2092998A5 (en) * 1970-05-15 1972-01-28 Anvar
EP0165741A2 (en) * 1984-06-22 1985-12-27 Varian Associates, Inc. Double post reentrant cavity for NMR probes
EP0223284A2 (en) * 1985-11-02 1987-05-27 Philips Patentverwaltung GmbH High frequency coil arrangement for nuclear spin resonance device
US4996482A (en) * 1988-09-22 1991-02-26 Jeol Ltd. Capacitor stick for NMR probe
US4851961A (en) * 1988-11-14 1989-07-25 Funk Alexander L Endless reactor
EP0401967A2 (en) * 1989-06-09 1990-12-12 Oxley Developments Company Limited Adjustable electrical device
DE4239041A1 (en) * 1991-11-22 1993-05-27 Varian Associates

Also Published As

Publication number Publication date
EP0930511B1 (en) 2006-06-21
EP0930511A2 (en) 1999-07-21

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